const fs = require('fs');
const util = require('util');
const promisify = require('util').promisify;
const readFile = promisify(fs.readFile);
async function run() {
    let r1 = await readFile('./1.txt', 'utf8');
    let r2 = await readFile('./2.txt', 'utf8');
    let r3 = await readFile('./3.txt', 'utf8');
    console.log(r1);
    console.log(r2);
    console.log(r3);
}
run();